Sökning: "Diffusive flux"

Hittade 5 uppsatser innehållade orden Diffusive flux.

  1. 1. Effects of vegetation and nutrients on methanotroph abundance and methane emissions from constructed wetlands

    Master-uppsats, SLU/Dept. of Aquatic Sciences and Assessment

    Författare :Klara Yngve; [2022]
    Nyckelord :Diffusive flux; Ebullition; Dissolved CH4; CH4 oxidation; Phosphorous;

    Sammanfattning : Agriculture is the largest anthropogenic source of nitrogen and phosphorous (P) leakage to Swedish coastal seas, causing eutrophication which threatens marine ecosystems. Constructing wetlands is one way to improve nutrient retention in the modern agricultural landscape. However, constructed wetlands can emit substantial amounts of methane (CH4). LÄS MER

  3. 2. Measuring resistivity in a contactless fashion

    Kandidat-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Jim Klintrup; [2020]
    Nyckelord :resistivity; magnetic; field; diffusive; eddy; current; coils; Physics and Astronomy;

    Sammanfattning : The aim of this thesis work was to develop a rig to measure the resistivity of a metal sample. The initial testing of the rig would be done at room temperature and calibration of the setup would be done with aluminum samples and then metallic alloys would be studied. LÄS MER

  4. 3. Analys av metanflöden från sjön Erken

    Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Ryan Mintz; [2016]
    Nyckelord :methane; transfer velocity; flux; waterside concentration; eddy covariance; Nyckelord: metan; utbyteskoefficient; flux; metankoncentration; eddy kovarians;

    Sammanfattning : While it is not the most abundant greenhouse gas, a significant portion of the greenhouse effect is caused by methane. The amount of methane in the atmosphere is increasing, indicating that there is a continuous source of methane to the atmosphere. LÄS MER

  5. 4. Diffusive gas fluxes in neotropical rainforest streams

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Björn Skoglund; [2015]
    Nyckelord :Carbon dioxide; diffusive flux; tropics; greenhouse gas; rainforest;

    Sammanfattning : Rainforests are of great importance to global carbon cycling, but the importance of deforestation and change in land use is poorly understood due to a lack of studies quantifying the difference in carbon fluxes between original rainforest and agricultural land. Furthermore, the aquatic outgassing of neotropical systems have been proven to have greater impact on global carbon cycling than previously anticipated (Richey et al 2002). LÄS MER

  7. 5. Hydrogen diffusion in nano-sized materials : investigated by direct imaging

    Uppsats för yrkesexamina på avancerad nivå, Materialfysik

    Författare :Andreas Bliersbach; [2011]
    Nyckelord :hydrogen; diffusion; hydrogen diffusion; metal hydride; vanadiumhydride; vanadium hydride; VHx; thin-film; thin film;

    Sammanfattning : The kinetics of interstitial hydrogen are of great interest and importance for metal-hydride storage, purification, fusion and fission reactor technology, material failure processes, optical sensors for hydrogen gas and many other technologies. In particular nano-sized materials motivate fascinating applications and scientific questions. LÄS MER